STAX SR-009S Ex-Demonstration Electrostatic Earspeaker

This Ex-Demonstration STAX SR-009S electrostatic earspeaker is offered in excellent condition, complete with all original packaging, accessories, and full manufacturer warranty. Professionally maintained and carefully handled, it represents an outstanding opportunity to own one of the world’s most revered reference headphones at a significant saving.

For delivery enquiries, product information, or to book your personal audition, please telephone 01603 627010.

Japanese Reference-Grade Electrostatic Earspeaker

The STAX SR-009S stands as the pinnacle of STAX’s electrostatic technology — a culmination of decades of research, craftsmanship, and innovation. Renowned for its breathtaking transparency, detail retrieval, and tonal purity, the SR-009S delivers a reference-level listening experience that captures every nuance of the music with natural precision and spatial realism.

Advanced MLER2 Electrode Innovation

This model features STAX’s second-generation MLER2 (Multi-Layer-Elect-Rords) fixed electrode design, incorporating:

• Gold-plated electrodes to minimise resonance and improve conductivity

• A refined edge-smoothing process reducing air resistance for enhanced sound permeability

• Improved linearity across the frequency range through superior diaphragm control

• Lower electrical resistance for exceptional signal transfer and harmonic clarity

Ultra-Thin Diaphragm Precision

At the heart of the SR-009S lies an ultra-thin polymer diaphragm, delivering unmatched transient speed and accuracy. Its lightweight, ultra-stable construction ensures faithful reproduction of every microdynamic, with an extended frequency response from 5Hz to 42kHz and high sensitivity of 101dB for effortless dynamics and transparency.

Premium Cable and Acoustic Architecture

• Silver-plated 6N OFC conductors for pristine signal transfer

• Low-capacitance parallel design reducing interference and phase distortion

• 2.5-metre cable length providing optimal flexibility for dedicated listening setups

• Channel identification markings for easy orientation and setup

Craftsmanship and Comfort

Designed for long listening sessions, the SR-009S features:

• Genuine leather ear pads for superior comfort and acoustic sealing

• Precision-machined aluminium housings to reduce unwanted resonance

• Lightweight construction (441g without cable) ensuring fatigue-free wear

Technical Specifications

• Type: Push-pull electrostatic, large circular sound element

• Frequency Response: 5Hz–42,000Hz

• Sensitivity: 101dB / 100V r.m.s. input / 1kHz

• Capacitance: 110pF (including cable)

• Impedance: 145kΩ (including cable, at 10kHz)

• Bias Voltage: DC 580V

• Weight: 441g (without cable), 563g total

Condition and Warranty

This Ex-Demonstration STAX SR-009S has been meticulously maintained and is presented in excellent cosmetic and operational condition. Supplied with original packaging, accessories, and a full manufacturer warranty, it offers the rare opportunity to experience STAX reference performance at a reduced price.

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